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8148 board base driver testing

charle jun
Prodigy 10 points

Everybody is good:
When I test 8148 bare board code i2c2_io_expander, the code is from 8148 CD, I use CCS for testing.
But print a message is as follows:

  Unable to detect the IO expander on EVM at Slave addr 0x21.
  [CortexA8] Unable to initialize the IO Expander for I2C-2 module on the IO Expander board.
  [CortexA8]      FAIL... error code -1... quitting
I hope to find a better way!!  
 thanks all  .